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$109 Cheap Flights from Kansas City (MCI) to St. Louis (STL)

View $109 flight on Mon, Sep 14, 2026Opens in a new window

Popular airlines from Kansas City International Airport (MCI) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Kansas City to St. Louis (MCI-STL)

Prices were available within the past 7 days and start at $109 for one-way flights and $243 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Mon, Sep 14 - Mon, Sep 21
MCI
Kansas City
STL
St. Louis
$243 Roundtrip, found 10 hours ago
$243
Roundtrip
found 10 hours ago
Select Frontier Airlines flight, departing Mon, Sep 14 from Kansas City to St. Louis, returning Mon, Sep 21, priced at $243 found 10 hours ago
Southwest Airlines
Wed, Nov 4 - Thu, Nov 5
MCI
Kansas City
STL
St. Louis
$247 Roundtrip, found 3 days ago
$247
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Wed, Nov 4 from Kansas City to St. Louis, returning Thu, Nov 5, priced at $247 found 3 days ago
Frontier Airlines
Thu, Sep 3 - Sat, Sep 5
MCI
Kansas City
STL
St. Louis
$248 Roundtrip, found 4 days ago
$248
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Thu, Sep 3 from Kansas City to St. Louis, returning Sat, Sep 5, priced at $248 found 4 days ago
Frontier Airlines
Sun, Sep 20 - Mon, Sep 21
MCI
Kansas City
STL
St. Louis
$249 Roundtrip, found 18 hours ago
$249
Roundtrip
found 18 hours ago
Select Frontier Airlines flight, departing Sun, Sep 20 from Kansas City to St. Louis, returning Mon, Sep 21, priced at $249 found 18 hours ago
Southwest Airlines
Wed, Nov 4 - Thu, Nov 5
MCI
Kansas City
STL
St. Louis
$251 Roundtrip, found 3 days ago
$251
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Wed, Nov 4 from Kansas City to St. Louis, returning Thu, Nov 5, priced at $251 found 3 days ago
Southwest Airlines
Wed, Nov 4 - Thu, Nov 5
MCI
Kansas City
STL
St. Louis
$255 Roundtrip, found 3 days ago
$255
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Wed, Nov 4 from Kansas City to St. Louis, returning Thu, Nov 5, priced at $255 found 3 days ago
United
Sat, Sep 19 - Tue, Sep 22
MCI
Kansas City
STL
St. Louis
$256 Roundtrip, found 6 days ago
$256
Roundtrip
found 6 days ago
Select United flight, departing Sat, Sep 19 from Kansas City to St. Louis, returning Tue, Sep 22, priced at $256 found 6 days ago
Frontier Airlines
Mon, Sep 14 - Tue, Sep 15
MCI
Kansas City
STL
St. Louis
$258 Roundtrip, found 3 hours ago
$258
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Mon, Sep 14 from Kansas City to St. Louis, returning Tue, Sep 15, priced at $258 found 3 hours ago
Delta
Thu, Oct 1 - Sun, Oct 4
MCI
Kansas City
STL
St. Louis
$292 Roundtrip, found 22 hours ago
$292
Roundtrip
found 22 hours ago
Select Delta flight, departing Thu, Oct 1 from Kansas City to St. Louis, returning Sun, Oct 4, priced at $292 found 22 hours ago
American Airlines
Wed, Sep 30 - Wed, Oct 7
MCI
Kansas City
STL
St. Louis
$361 Roundtrip, found 1 day ago
$361
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Sep 30 from Kansas City to St. Louis, returning Wed, Oct 7, priced at $361 found 1 day ago

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $356
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $356

What you need to know for your flight from Kansas City Intl. to Lambert-St. Louis Intl.

Kansas City (MCI) to St. Louis (STL) at a glance

Travel between Kansas City (MCI) and St. Louis (STL) with a selection of airlines catering to this domestic short-haul route. Whether you’re searching for cheap flights from Kansas City or prefer a full-service experience, you can compare various options to find the best itinerary that suits your budget and travel plans. As you prepare to explore the iconic attractions and vibrant neighborhoods of St. Louis, discover key details for flights from Kansas City International Airport to Lambert-St. Louis International Airport.

  • Fastest flight duration: around 1 hour non-stop
  • Route distance: roughly 250 miles (400 km)
  • Flights per week: around 8 departures on average
  • Typical fares (one-way): economy tickets often range from $40–$405, depending on seasonality and how far ahead you book

Flights from Kansas City International Airport (MCI) to Lambert-St. Louis International Airport (STL)

Based on recent traveler bookings, here are the top airlines flying from Kansas City to St. Louis, commonly selected for both non-stop and one-stop options. Popular layover choices include O'Hare International Airport (ORD) with about a 55-minute layover, and Midway International Airport (MDW), which has around a 1 hour and 15-minute layover. This variety allows you to mix and match factors like price, total travel time, and cabin class to create the ideal itinerary for your journey.

  • Southwest Airlines: This budget-friendly airline provides both non-stop and one-stop options, with one-way ticket prices generally falling between $40 and $405. Southwest is responsible for about 90% of the departures on this route, with a typical non-stop flight duration of just 1 hour.
  • American Airlines: A comprehensive service airline, American Airlines offers one-stop journeys with one-way fares usually ranging from $160 to $355. They account for around 8% of the flights on this route, with an in-flight duration of 3 hours and a total travel time, including layover, of approximately 4 hours and 15 minutes.

Best time to fly from Kansas City (MCI) to St. Louis (STL)

The most popular months for travelers flying from Kansas City to St. Louis are March, April, and September, when peak temperatures in St. Louis reach up to 70.9°F in September. If you prefer quieter travel, consider December, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 37.8°F. For better deals, October usually offers the lowest average one-way fare around $173. Flight availability peaks in April, June, July, August, September, October, November, and December, with approximately 8 flights per week, making it easier to find convenient departure times. January, February, March, and May have the fewest flights, with approximately 7 flights per week.

  • Cheapest time to fly: October usually offers good deals with average one-way fare around $173, roughly 27% cheaper than the yearly average.
  • Another budget-friendly time to fly: August typically offers an average one-way fare of around $182.
  • Most flight options: April, June, July, August, September, October, November, and December have the highest number of flights from Kansas City to St. Louis, with approximately 8 flights per week, giving you more flexibility in scheduling your trip.
calendar iconMonthtemperature iconTemperaturecrowd level iconDemandflights iconWeekly Flightsprice iconAverage one-way Fare
January31.6°F (-0.2°C)Low7$286
February34.9°F (1.6°C)Low7$293
March46.4°F (8.0°C)High7$251
April56.1°F (13.4°C)High8$240
May66.6°F (19.2°C)Average7$217
June76.1°F (24.5°C)Average8$270
July78.6°F (25.9°C)Average8$267
August77.0°F (25.0°C)Average8$182
September70.9°F (21.6°C)High8$231
October58.6°F (14.8°C)Average8$173
November46.2°F (7.9°C)Average8$212
December37.8°F (3.2°C)Low8$243

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative routes from Kansas City (MCI) to St. Louis (STL)

  • Kansas City to St. Louis (MKC-STL): Charles B. Wheeler Downtown Airport (MKC) lies approximately 14 miles from Kansas City International Airport (MCI), making it a convenient option for travelers.
  • Kansas City to St. Louis (MCI-SUS): Spirit of St. Louis Airport (SUS) is located roughly 16 miles from Lambert-St. Louis International Airport (STL), providing an accessible route for passengers.
  • Kansas City to St. Louis (MCI-CPS): St. Louis Downtown Airport (CPS) is also about 16 miles from Lambert-St. Louis International Airport (STL), offering yet another travel alternative for flyers.

How to find the best prices for flights from Kansas City (MCI) to St. Louis (STL)

Getting some of the best deals on flights from Kansas City to St. Louis is all about timing and flexibility. Here are some key tips to help you save:

  1. Best times to book and fly: cheaper fares are typically found when booking at least two months in advance, although most travelers book their flights 2 to 8 weeks ahead. Departures in the morning, from 5 a.m. to 12 p.m., tend to offer lower prices and are also the most popular flight times. Additionally, flying on Thursday provides both cheaper prices and is the most favored travel day.
  2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
  3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
  4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
  5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
  6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Lambert-St. Louis International Airport from Kansas City International Airport

St. Louis welcomes travelers from Kansas City with a range of transport options based on price, convenience, and proximity. Here's how to reach St. Louis efficiently:

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in St. Louis, with private rides that can be arranged in advance.
  • Car rental: Renting a car from Lambert-St. Louis International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Lambert-St. Louis International Airport on Expedia.
  • Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
  • Public transportation: From Lambert-St. Louis International Airport, Lambert Main Terminal Station, a metro station, is located just 0.1 miles away on foot, providing convenient access to public transportation for travelers.

Frequently asked questions

How much does a flight from Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?
You can find cheap one-way flights from $109 and cheap return flights from $243 Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) with Expedia. One-way flights generally range between $165 and $759, and roundtrip flights usually range from $329 to $1114. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The cheapest month to fly from MCI to STL is September when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Enter MCI to STL and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
To find a cheap flight from Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best airline to fly with from Kansas City, MO (MCI) to St. Louis, MO (STL) will differ from traveler to traveler. If you like to fly early, WN offers early morning flights. If price is the most important factor, WN typically offers the lowest fares. WN offers the most daily flights from MCI to STL, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
How many flights per day from Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You can find approximately 3 nonstop flights per day from Kansas City Intl. (MCI) to Lambert-St. Louis Intl. (STL). For more options, look at flights that include layovers.
What is the earliest flight from Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The earliest flight from Kansas City International Airport (MCI) to Lambert-St. Louis International Airport (STL) typically departs at around 5:00 AM, operated by American Airlines and Southern Airways Express. This is a seasonal service active in June, giving you a great start to your day in St. Louis. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The most popular departure times for flights from Kansas City, MO (MCI) to St. Louis, MO (STL) are in the early morning, from 6am to 9am. About 23% of passengers prefer this time window. Many major carriers, including Southwest Airlines and United Airlines, offer flights during this window. This timing is popular because it allows you to arrive in St. Louis with a full day ahead of you.
How long does it take to fly from Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Direct flights from MCI to STL usually take about 1 hour, traveling roughly 237 miles. If you opt for a connecting flight, expect to add around 5 hours 30 minutes to your journey. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You can fly first class between MCI and STL. First class cabins are available on:

  • American Airlines
  • Delta Air Lines
  • United Airlines

How do I earn miles on a Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight with Expedia?
It's easy to earn miles on a Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for St. Louis from Kansas City Intl. (MCI)?
From Kansas City Intl. (MCI), you can fly into Lambert-St. Louis Intl. (STL) to reach St. Louis. Some flights may connect through major hubs like Love Field (DAL), William P. Hobby (HOU), Nashville Intl. (BNA) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) at the last minute?
Typically, booking a last minute flight from Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package?
Securing a Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) St Louis Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
If you booked your Kansas City, MO (MCI-Kansas City Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Kansas City Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$243
Distance
236 mi
Average flight time
1 hour 2 mins

Book with confidence

Kansas City to St. Louis Flights

The cheapest times to fly from Kansas City to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Kansas City to St. Louis are during the month of September. You can find some of the cheapest flights from Kansas City to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Kansas City to St. Louis

Sunday is one of the best days to book for cheap flights from Kansas City to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Kansas City to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Kansas City to St. Louis in 2026. You can also book with separate airlines for your outbound and return journeys, from $109 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Kansas City to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Kansas City to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Kansas City to St. Louis Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

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